56 questions linked to/from What is time dilation really?
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### Why are time dilation and length contraction needed to fix time? [duplicate]

In many textbooks and online answers I have heard people go on about how time dilation accounts for the gap of time experienced between two observers. However, they continue that in reality this is ...
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### Time dilation. Why? [duplicate]

We are able to predict, measure and mathematically demonstrate time dilation, but are we able to explain 'why' it happens? what would be that explanation? Edit1 Think the question backwards: After ...
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### Twin Paradox Without Acceleration [duplicate]

So I've been doing a lot of reading about the twin paradox and have encountered several different explanations that strive to resolve it. First off let me start by saying general relativity is not an ...
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### Does Inertial time dilation demonstrate that Time is not a dimension? [duplicate]

If time is a dimension and 'now' simply an expression of your position with respect to that dimension, the progress of any object along that dimension should remain in step with all other objects. By ...
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### Does time really slow down in relativity, or is it an illusion caused by the Doppler shifting of light? [duplicate]

Does time really dilate, or is it only how we perceive time, which is in the form of light waves. When an object moves away from another object at very high speeds, the light takes longer to reach it ...
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### Why does the clock work slowly at higher speed? [duplicate]

I know nothing about relativity but I cannot accept that there is a phenomenon called time dilation. However I have no problem with it because of mathematics behind it. I have no problem if time is ...
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### To Be Forever Young [duplicate]

It is clear from the Lorentz Parameters, applied to Einstein's Equations, that as velocity, v approaches speed-of-light, c, the denominator (1 - [v/c]) tends to zero; when v=c, time, t=0: time stops?! ...
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### Time and acceleration [duplicate]

I am confused by the explanations of time dilation and gravity vs. acceleration. The consensus (and apparently experiments) is that time dilation in a gravitational field (not free-falling) is "as if" ...
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### Time dilation when an object moves [duplicate]

Why does time dilation happens when the object moves, is it just because the physical processes, in the moving objects, happens slower? (this video suggests this: https://youtu.be/Ci4L6myFFng?t=224) ...
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### Paradox - Special Theory of Relativity (edited) [duplicate]

I have been asked to retitle this question and I have been asked to edit the question to adhere to mainstream physics. And I simplified it. So here it is: Two cars approach each other at the same ...
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### Why is the onboard trip shorter when riding on a relativistic rocket as compared to a Newtonian rocket? [duplicate]

In the top answer for this question on the Space Exploration StackExchange, it's calculated that a rocket traveling at constant 1g of acceleration over 100,000 light years would, under Newtonian ...
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### 1 sec pass for the person rode on light [duplicate]

I heard that moving object is time passed slower than stopped object is. Then, if stopped object passed 1 sec, does how much time passed 'person A' rode on light? Thanks in advance
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### Trying to understand velocity addition and time dilation [duplicate]

I'm familiar with Einstein's formulae $V=\frac{u+v}{1+ \frac{uv}{c^2}}$ and $\Delta t'=\frac{\Delta t}{\sqrt{1-\frac{v^2}{c^2}}}$, the former being velocity addition and the latter being time dilation....